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Other Intangible Assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets Other Intangible Assets
Our identifiable intangible assets are as follows (in thousands):
As of December 31, 2024As of December 31, 2023
Useful LifeGrossAccumulated AmortizationNet GrossAccumulated AmortizationNet
Intangible assets subject to amortization:
Customer relationships
11.6 - 13.4 years
$234,231 $(47,320)$186,911 $210,000 $(28,664)$181,336 
Marketing contract 20 years— — — 144,219 (42,064)102,155 
Rights-of-way assets
8 - 35 years
14,892 (1,778)13,114 14,892 (1,078)13,814 
Favorable contract
4.8 years
4,775 (307)4,468 — — — 
Intangible assets not subject to amortization:
Rights-of-way assets Indefinite76,965 76,965 45,722 45,722 
Total$330,863 $(49,405)$281,458 $414,833 $(71,806)$343,027 
Amortization of the rights-of-way assets and customer relationships intangibles assets was $19.6 million, $18.7 million and $10.9 million for the years ended December 31, 2024, 2023 and 2022, respectively, and is included in depreciation and amortization in the accompanying consolidated statements of income and comprehensive income. Amortization of the marketing contract was $4.2 million during the year ended December 31, 2024 and $7.2 million during the years ended December 31, 2023 and 2022 and is included as a reduction of net revenue in the accompanying consolidated statements of income and comprehensive income. This marketing contract intangible was transferred to Delek Holdings in conjunction with assignment agreement entered into on August 5, 2024; see Note 4 for additional information.
Amortization expense for the next five years is estimated to be as follows (in thousands):
2025$21,618 
2026$21,618 
2027$21,618 
2028$21,618 
2029$21,059